Marine aluminum alloy plate oil immersion corrosion test method, device and sample

Abstract

The application discloses a marine aluminum alloy plate oil immersion corrosion test method and device and a sample. A 50mm*50mm*4mm sample is processed on a marine aluminum alloy plate, and after surface treatment, the sample is placed in a special oil solution with a special ratio. Different test immersion periods are set. In the test process, a potentiometer is used to collect the potential change of the test sample. After the test, the average corrosion rate of the sample is calculated by the weight loss method, and the sample surface corrosion pit depth information is measured by a microscopic method, so that the corrosion evaluation of the marine aluminum alloy plate in the oil environment is realized. The application provides an evaluation method for the corrosion of the aluminum ship alloy plate in the oil environment. The method has high practical utility, is simple to operate, and can be popularized and used in the industry.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of ship aluminum alloy material performance, relates to the determination of the corrosion resistance of aluminum alloy plate, and particularly relates to a marine aluminum alloy plate oil contamination immersion corrosion test method, device and sample. BACKGROUND

[0002] Due to the advantages of high strength and good corrosion resistance, the application scale of aluminum alloy materials on ships is increasing, which effectively reduces the weight of the ship body, increases the loading capacity of the ship and improves the sailing speed.

[0003] There is a large amount of fuel and seawater mixture in the oil contamination replacement cabin and other areas of the ship structure, which can cause corrosion to the aluminum alloy plate. In addition, the ship will also be corroded by oil contamination water during the docking process. There is no special evaluation method for the corrosion resistance of aluminum alloy materials in the oil contamination environment.

[0004] Based on the above background, the applicant proposes a marine aluminum alloy plate oil contamination test method, test device and test sample suitable for the actual situation of corrosion evaluation of the marine aluminum alloy ship body in the oil contamination environment. SUMMARY

[0005] To solve the problems in the prior art, the present application provides a marine aluminum alloy plate oil contamination immersion corrosion test method, device and sample. After using the test method, device and sample, a sample of 50mm*50mm*4mm is machined on the marine aluminum alloy plate, placed in a specially prepared oil contamination solution after surface treatment, different test immersion periods are set, the potential change of the test sample is collected by a potentiometer during the test, and after the test, the average corrosion rate of the sample is calculated by the weight loss method, and the surface corrosion pit depth information of the sample is measured by a microscopic method, so as to realize the corrosion evaluation of the marine aluminum alloy plate in the oil contamination environment.

[0006] To solve the above technical problems, the technical scheme adopted by the present application is:

[0007] The present application provides a marine aluminum alloy plate oil contamination immersion corrosion test method, which comprises the following steps:

[0008] Step one: according to the size requirement, cutting out an immersion test sample on the marine aluminum alloy plate to be evaluated, and reserving a hanging hole and a mark hole on the sample;

[0009] Step two: polishing the surface of the sample using sandpaper, removing the aluminum coating and rust layer on the surface of the sample, and wiping the surface of the sample with anhydrous alcohol after polishing to remove oil stains and impurities on the surface of the sample;

[0010] Step three: after the surface of the sample is wiped, the surface of the sample is dried by using dry air, the size of the sample is measured by using a vernier caliper, and the surface area of the sample is calculated after the measurement;

[0011] Step four: the weight of the sample is weighed by using an electronic balance;

[0012] Step five: based on the foregoing steps, after the sample is prepared, the sample is soaked in a prepared simulated oil stain solution, and the test period is 1 month, 3 months and 6 months respectively;

[0013] Step six: during the test of step five, the potential of the sample is measured by using a potentiometer;

[0014] Step seven: after the test is completed, the soaked sample is taken out, the corrosion product on the surface of the sample is removed by using pickling method, the surface material of the sample is removed by using ultrasonic cleaning method after pickling, and then the sample is dried by using dry air;

[0015] Step eight: the sample after the soaking test is weighed by using an electronic balance, and the weight of the sample after the test is recorded;

[0016] Step nine: the surface morphology of the sample after the test is observed by using a microscope, the maximum corrosion depth of the sample is measured, the average corrosion amount of the aluminum alloy plate is calculated by weight loss, and the oil stain resistance of the aluminum alloy plate is evaluated.

[0017] In order to solve the technical problems, the further technical solutions adopted by the present application are:

[0018] Optionally, in the above-mentioned oil stain soaking corrosion test method of the marine aluminum alloy plate, in step one, each group of test parallel samples is 3, the size of each sample is 50mm*50mm, the thickness is 4mm, the hanging hole and the mark hole are arranged at the corresponding positions of the sample, the hanging hole and the mark hole are both circular holes with a diameter of 2mm, the hanging hole is used for hanging the aluminum alloy plate sample during the soaking test, and the mark hole is used for marking the samples of different test periods, so that the samples can be distinguished.

[0019] Optionally, in the above-mentioned oil stain soaking corrosion test method of the marine aluminum alloy plate, in step one, each group of test parallel samples is 3, the size of each sample is 50mm*50mm, in steps two and three, the surface of the sample is polished by using 800# sandpaper, and the calculation formula of the surface area of the sample is: S=S 试样 -S 悬挂孔 -S 标记孔 ; wherein, S is the surface area of the sample after the hole is opened; S 试样 is the surface area of the sample before the hole is opened; S悬挂孔 S is the hole area of the hanging hole of the sample; 标记孔 S is the hole area of the marking hole of the sample.

[0020] Optionally, the ship aluminum alloy plate oil immersion corrosion test method, wherein in step one, each group of test parallel samples is 3, and each sample has a size of 50mm*50mm; in steps three and four, the vernier caliper measures the size of the sample with a measurement accuracy of not less than 0.01mm; and the electronic balance measures the weight of the sample with a measurement accuracy of not less than 0.001g.

[0021] Optionally, the ship aluminum alloy plate oil immersion corrosion test method, wherein in step one, each group of test parallel samples is 3, and each sample has a size of 50mm*50mm; in step five, the simulated oil solution is a mixed solution of seawater and artificial machine oil.

[0022] Further optionally, the ship aluminum alloy plate oil immersion corrosion test method, wherein the mixing ratio of the seawater and the artificial machine oil is 99:1, and the artificial machine oil is 32# machine oil.

[0023] Optionally, the ship aluminum alloy plate oil immersion corrosion test method, wherein in step six, the frequency of measuring the potential of the sample by using the potentiometer is 1 minute / time, and the data of the potential is stored on the computer by the industrial computer.

[0024] Further optionally, the ship aluminum alloy plate oil immersion corrosion test method, wherein in the process of measuring the potential of the sample by using the potentiometer, the sample is kept in a suspended state to avoid the contact between the sample and the side wall of the container.

[0025] To solve the above technical problems, the technical solution adopted by the present application is:

[0026] The present application provides a test sample for oil immersion corrosion test, which comprises an aluminum alloy plate sample, wherein the size of the aluminum alloy plate sample is 50mm*50mm, the thickness is 4mm, a hanging hole and a marking hole are arranged at corresponding positions of the aluminum alloy plate sample, the hanging hole and the marking hole are both circular holes with a diameter of 2mm, the hanging hole is used for suspending the aluminum alloy plate sample during the immersion test, and the marking hole is used for marking samples of different test periods, so that the samples can be distinguished.

[0027] Optionally, the test sample for oil immersion corrosion test, wherein the aluminum alloy plate sample is a ship 5083 aluminum alloy plate sample.

[0028] Correspondingly, the application also provides a test device for oil immersion corrosion test, comprising: an aluminum alloy plate sample with a hanging hole and a marking hole, a container, a simulated oil solution, a potentiometer and a plurality of wires, the simulated oil solution is arranged in the container, the aluminum alloy plate sample is suspended and immersed in the simulated oil solution, one end of the potentiometer is connected with the simulated oil solution through a wire, and the other end of the potentiometer is connected with the aluminum alloy plate sample through another wire.

[0029] Compared with the prior art, the application has the following technical effects:

[0030] The oil immersion corrosion test method of the marine aluminum alloy plate of the application comprises the following steps: cutting out an immersion test sample on the to-be-evaluated marine aluminum alloy plate according to the size requirements, and reserving a hanging hole and a marking hole on the sample; polishing the surface of the sample using sandpaper to remove the aluminum cladding layer and the rust layer on the surface of the sample, and then wiping the surface of the sample with anhydrous alcohol to remove the oil impurities on the surface of the sample; after the surface of the sample is wiped, the surface of the sample is blown dry with dry air, the outer dimensions of the sample are measured using a vernier caliper, and the surface area of the sample is calculated after the measurement; the weight of the sample is weighed using an electronic balance; based on the foregoing steps, after the sample is prepared, the sample is immersed in a prepared simulated oil solution, and the test period is 1 month, 3 months and 6 months respectively; during the test in step five, the potential of the sample is measured using a potentiometer; after the test is completed, the immersed sample is taken out, the corrosion products on the surface of the sample are removed by pickling, the surface substances of the sample are removed by ultrasonic cleaning after pickling, and then the sample is blown dry with dry air; the sample after the immersion test is weighed using an electronic balance, and the weight of the sample after the test is recorded; the surface morphology of the sample after the test is observed using a microscope, the maximum corrosion depth of the sample is measured, the average corrosion amount of the aluminum alloy plate is calculated by weight loss, and the oil resistance of the aluminum alloy plate is evaluated; the sample of 50mm*50mm*4mm is processed on the marine aluminum alloy plate, the sample is placed in a specially prepared oil solution after surface treatment, different test immersion periods are set, the potential change of the test sample is collected by using a potentiometer during the test, the average corrosion rate of the sample is calculated by weight loss method after the test is completed, and the surface corrosion pit depth information of the sample is measured by microscopic method, so as to realize the corrosion evaluation of the marine aluminum alloy plate in the oil environment, and provide an evaluation method for the corrosion of the aluminum ship alloy plate in the oil environment for the industry, which has high actual utility, is simple to operate, and can be popularized and used in the industry.

[0031] The above description is only a summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, and the content of the specification can be implemented as follows. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0033] Figure 1 is a flowchart of the oil immersion corrosion test method of the marine aluminum alloy plate according to the present application;

[0034] Figure 2 is a structural schematic diagram of the test sample for the oil immersion corrosion test according to the present application (3 parallel test samples for each test group);

[0035] Figure 3 is a structural schematic diagram of the test device for the oil immersion corrosion test according to the present application;

[0036] Figure 4 is a sample morphology schematic diagram of the sample before the test according to the present application;

[0037] Figure 5 is a sample morphology schematic diagram of the sample before pickling according to the present application;

[0038] Figure 6 is a sample morphology schematic diagram of the sample after pickling according to the present application;

[0039] Figure 7 is a data comparison of the sample immersed in the prepared simulated oil solution before and after different test periods according to the present application;

[0040] Figure 8 is a potential change curve diagram of the sample immersed in the prepared simulated oil solution according to the present application;

[0041] Figure 9 is a corrosion rate change diagram of the sample in different test periods according to the present application.

[0042] Among them, the hanging hole 1, the marking hole 2, the aluminum alloy plate sample 3, the container 4, the simulated oil solution 5, the potentiometer 6 and the plurality of wires 7. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application. In addition, it should be understood that the specific implementation described herein is only used to illustrate and explain the present application, and is not used to limit the present application. In the present application, the orientation words such as "upper", "lower", "left", "right" generally refer to the upper, lower, left and right of the device in the actual use or working state, and specifically refer to the direction of the drawing surface in the drawings.

[0044] The present application provides a marine aluminum alloy plate oil immersion corrosion test method, device and electric vehicle, which are described in detail below. It should be noted that the description order of the following embodiments is not limited as the preferred order of the embodiments of the present application. In the following embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0045] The present application processes a 50mmx50mmx4mm sample on a marine aluminum alloy plate, places the sample in a specially formulated oil solution after surface treatment, sets different test immersion periods, uses a potentiometer to collect the potential change of the test sample during the test, calculates the average corrosion rate of the sample by the weight loss method after the test, and measures the sample surface corrosion pit depth information by a microscopic method, so as to realize the corrosion evaluation of the marine aluminum alloy plate in the oil environment, and provide an evaluation method for the corrosion of the aluminum ship alloy plate in the oil environment, which has high actual utility, simple operation and can be popularized and used in the industry.

[0046] Embodiment 1

[0047] Please refer to Figures 1-9 The present application provides a marine aluminum alloy plate oil immersion corrosion test method, which comprises the following steps:

[0048] Step one: according to the size requirement, cut out the immersion test sample on the marine aluminum alloy plate to be evaluated, and reserve the hanging hole and the mark hole on the sample;

[0049] Step two: polish the surface of the sample using sandpaper, remove the aluminum coating and rust layer on the surface of the sample, and wipe the surface of the sample with anhydrous alcohol after polishing to remove the oil impurities on the surface of the sample;

[0050] Step three: after the surface of the sample is wiped, the surface of the sample is dried with dry air, the size of the sample is measured with a vernier caliper, and the surface area of the sample is calculated after the measurement;

[0051] Step four: the weight of the sample is weighed with an electronic balance;

[0052] In the above steps one to four, a 4mm specification marine 5083 aluminum alloy plate is selected, and an oil immersion sample is processed in the aluminum alloy plate. After the sample is polished and degreased, the appearance is as shown in Figure 4 The size of the sample and the weight before the test are recorded;

[0053] Step five: based on the foregoing steps, after the sample is prepared, the sample is immersed in the prepared simulated oil solution, and the test period is 1 month, 3 months and 6 months respectively;

[0054] Step six: during the test of step five, the potential of the sample is measured with a potentiometer;

[0055] In the above steps five and six, a specially configured oil simulation solution is added to the container, the solution ratio is 99% seawater + 1% machine oil (32#), the test period is 1 month, 2 months and 3 months respectively, and the potential of the sample is measured with a potentiometer during the test, as shown in Figure 3

[0056] Step seven: after the test is completed, the immersed sample is taken out, the corrosion products on the surface of the sample are removed by pickling, the surface substances of the sample are removed by ultrasonic cleaning after pickling, and then the sample is dried with dry air;

[0057] Step eight: the sample after the immersion test is weighed with an electronic balance, and the weight of the sample after the test is recorded;

[0058] In the above steps seven and eight, the sample is taken out from the container as shown in Figure 5 after the immersion test period meets the requirements, the surface dirt is removed by pickling, the sample surface is dried after cleaning as shown in Figure 6 , and the weight of the sample after the test is weighed with an electronic balance;

[0059] Step nine: the surface morphology of the sample after the test is observed with a microscope, the maximum corrosion depth of the sample is measured, the average corrosion amount of the aluminum alloy plate is calculated by weight loss, and the oil resistance of the aluminum alloy plate is evaluated, as shown in Figure 7

[0060] In the above step nine, the potential change curve during the test is plotted according to the potential data as shown in Figure 8 ​​The corrosion rate of the sample was calculated by weight loss method as shown in the following table. Figure 9 The maximum depth of the corrosion pits was measured.

[0061] In step one, each group of test parallel samples was 3, and each sample had a size of 50mm x 50mm and a thickness of 4mm. The hanging hole and the mark hole were opened at the corresponding positions of the sample. Both the hanging hole and the mark hole were circular holes with a diameter of 2mm. The hanging hole was used to hang the aluminum alloy plate sample during the immersion test, and the mark hole was used to mark the sample of different test periods, so that the sample could be distinguished.

[0062] In steps two and three, the surface of the sample was polished using 800# sandpaper. The calculation formula of the surface area of the sample was S = S 试样 -S 悬挂孔 -S 标记孔 ; wherein S is the surface area of the sample after opening the hole; S 试样 is the surface area of the sample before opening the hole; S 悬挂孔 is the hole area of the hanging hole of the sample; and S 标记孔 is the hole area of the mark hole of the sample.

[0063] In steps three and four, the measurement accuracy of the vernier caliper for measuring the outer dimensions of the sample was not less than 0.01mm, and the measurement accuracy of the electronic balance for weighing the weight of the sample was not less than 0.001g.

[0064] In step five, the simulated oil stain solution used seawater and artificial machine oil mixed solution.

[0065] Further preferably, the mixing ratio of seawater to artificial machine oil is 99:1, wherein the artificial machine oil uses 32# machine oil.

[0066] In step six, the frequency of using the potentiometer to measure the potential of the sample was 1 minute per time, and the potential data was stored on the computer through the industrial computer.

[0067] Further preferably, during the process of using the potentiometer to measure the potential of the sample, the sample is kept in a suspended state to avoid contact between the sample and the side wall of the container.

[0068] Example 2

[0069] Please refer to Figure 2 、 Figure 4 、 Figure 5 and Figure 6This application also provides a test specimen for an oil immersion corrosion test, comprising: an aluminum alloy plate specimen 3, the aluminum alloy plate specimen 3 having a size of 50mm × 50mm and a thickness of 4mm, wherein a suspension hole 1 and a marking hole 2 are provided at corresponding positions on the aluminum alloy plate specimen 3, the suspension hole 1 and the marking hole 2 being circular holes with a diameter of 2mm, the suspension hole 1 being used to suspend the aluminum alloy plate specimen 3 during the immersion test, and the marking hole 2 being used to mark specimens of different test cycles so that the specimens can be distinguished.

[0070] In this embodiment, the aluminum alloy plate sample 3 is a marine-grade 5083 aluminum alloy plate sample.

[0071] Example 3

[0072] Please see Figure 3 This application also provides a test apparatus for an oil immersion corrosion test, comprising: an aluminum alloy plate sample 3 with a suspension hole 1 and a marking hole 2, a container 4, a simulated oil solution 5, a potentiometer 6, and several wires 7. The simulated oil solution 5 is disposed in the container 4, and the aluminum alloy plate sample 3 is suspended and immersed in the simulated oil solution 5. One end of the potentiometer 6 is connected to the simulated oil solution 5 through a wire 7, and the other end of the potentiometer 6 is connected to the aluminum alloy plate sample 3 through another wire 7.

[0073] To better distinguish samples from different test cycles, the marking holes 2 should be set in different positions on different aluminum alloy sheet samples 3, such as... Figure 3 As shown.

[0074] The working principle and process of this invention:

[0075] like Figure 1 As shown, a method for testing the corrosion of marine aluminum alloy plates by immersion in oil stains is provided, comprising the following steps:

[0076] First, according to the size requirements, cut out immersion test specimens from the marine aluminum alloy sheet to be evaluated, and leave hanging holes and marking holes on the specimens;

[0077] Next, use sandpaper to polish the surface of the sample to remove the aluminum coating and rust layer. After polishing, wipe the surface of the sample with anhydrous alcohol to remove oil and impurities.

[0078] Next, after wiping the surface of the sample, dry the surface of the sample with dry air, measure the external dimensions of the sample with vernier calipers, and calculate the surface area of ​​the sample after measurement;

[0079] Next, the weight of the sample was measured using an electronic balance;

[0080] Then, based on the foregoing steps, after the preparation of the sample is completed, the sample is immersed in the prepared simulated oil stain solution, and the test period is 1 month, 3 months and 6 months, respectively;

[0081] Then, during the test of step five, the potential of the sample is measured using a potentiometer;

[0082] Then, after the test is completed, the immersed sample is taken out, the corrosion product on the surface of the sample is removed by pickling, the surface material of the sample is removed by ultrasonic cleaning after pickling, and then the sample is dried by dry air;

[0083] Next, the sample after the immersion test is weighed using an electronic balance, and the weight of the sample after the test is recorded;

[0084] Finally, the surface morphology of the sample after the test is observed using a microscope, the maximum corrosion depth of the sample is measured, the average corrosion amount of the aluminum alloy plate is calculated by weight loss, and the oil stain resistance of the aluminum alloy plate is evaluated.

[0085] The above is only an embodiment of the present application, and is not limited to the patent scope of the present application. Any equivalent structure or direct or indirect application in other related technical fields based on the content of the specification and drawings is also included in the patent protection scope of the present application.

Claims

1. A method of oil immersion corrosion test for marine aluminum alloy plate material, characterized by: It comprises the following steps: Step one: according to the size requirements, cutting out the immersion test sample on the aluminum alloy plate to be evaluated, and reserving the hanging hole and the mark hole on the sample; each group of test parallel sample is 3, the size of each sample is 50mm*50mm, the thickness is 4mm, the hanging hole and the mark hole are opened on the corresponding position of the sample, the hanging hole and the mark hole are both 2mm diameter round hole, the hanging hole is used for suspending the aluminum alloy plate sample during the immersion test process, the mark hole is used for marking the sample of different test period, so that the sample can be distinguished; Step two: using sandpaper to polish the surface of the sample, removing the aluminum coating and rust layer on the surface of the sample, and wiping the surface of the sample with anhydrous alcohol after polishing to remove the oil stains and impurities on the surface of the sample; Step three: after wiping the surface of the sample, dry air is used to dry the surface of the sample, and the shape size of the sample is measured by using vernier caliper, and the surface area of the sample is calculated after measurement; Step four: the weight of the sample is weighed by using electronic balance; Step five: based on the foregoing steps, after the sample is prepared, the sample is immersed in the prepared simulated oil stain solution, and the test period is 1mth, 3mth and 6mth respectively; Step six: during the test of step five, the potential of the sample is measured by using potentiometer; Step seven: after the test is completed, the immersed sample is taken out, the corrosion products on the surface of the sample are removed by pickling method, the surface substances of the sample are removed by ultrasonic cleaning method after pickling, and then the sample is dried by using dry air; Step eight: the sample after immersion test is weighed by using electronic balance, and the weight of the sample after test is recorded; Step nine: the surface morphology of the sample after test is observed by using microscope, the maximum corrosion depth of the sample is measured, the average corrosion amount of aluminum alloy plate is calculated by weight loss, and the oil stain resistance of aluminum alloy plate is evaluated.

2. A method of testing marine aluminum alloy plate for oil immersion corrosion according to claim 1, characterized in that: In step two and step three, the surface of the sample is polished with 800# sandpaper, and the surface area of the sample is calculated by the following formula: ; wherein S is the surface area of the sample after the opening of the hole; is the surface area of the sample before the opening of the hole; is the hole area of the hanging hole of the sample; is the hole area of the marking hole of the sample.

3. The method of oil immersion corrosion test of marine aluminum alloy plate according to claim 1, characterized in that: In steps three and four, the measurement accuracy of the vernier caliper for measuring the shape size of the sample is not less than 0.01mm; the measurement accuracy of the electronic balance for weighing the weight of the sample is not less than 0.001g.

4. The method of oil immersion corrosion test for marine aluminum alloy plate according to claim 1, characterized in that: In step five, the simulated oil stain solution is a mixed solution of seawater and artificial machine oil.

5. A method of testing marine aluminum alloy plate for oil immersion corrosion according to claim 4, characterized in that: The mixing ratio of the seawater and the artificial machine oil is 99:1, wherein the artificial machine oil is 32# machine oil.

6. The method for oil immersion corrosion test of marine aluminum alloy plate according to claim 1, characterized in that: In step six, the frequency of measuring the potential of the sample by using potentiometer is 1 minute / time, and the data of the potential is stored on the computer by using industrial computer.

7. A method of testing marine aluminum alloy plate for oil immersion corrosion according to claim 6, characterized in that: During the process of measuring the potential of the sample by using potentiometer, the sample is kept in suspended state to avoid the contact between the sample and the side wall of the container.

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